Merge pull request #6 from tbrisevac/master

Game ID and status added to visualizer
updated modern.css
Merge pull request #7 from tbrisevac/master

New features
NPE bugfix for wholesale and tariff
blind fix for tariff analysis
Merge branch 'master' of github.com:tbrisevac/visualizer
Merge github.com:powertac/visualizer
Tariff analysis pagination; market transactions - number of timeslots to display; number of displayed decimal places in graphs; customers visualization - drill down pie chart; game overview spiderchart.